/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this 
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in 
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting 
  documentation, and that the name of the author not be used in 
  advertising or publicity pertaining to distribution of the 
  software without specific, written prior permission.

  The author disclaim all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \ingroup Group_USBClassMS
 *  @defgroup Group_USBClassMassStorageHost Mass Storage Class Host Mode Driver
 *
 *  \section Sec_Dependencies Module Source Dependencies
 *  The following files must be built with any user project that uses this module:
 *    - LUFA/Drivers/USB/Class/Host/MassStorage.c
 *
 *  \section Module Description
 *  Host Mode USB Class driver framework interface, for the Mass Storage USB Class driver.
 *
 *  @{
 */

#ifndef __MS_CLASS_HOST_H__
#define __MS_CLASS_HOST_H__

	/* Includes: */
		#include "../../USB.h"
		#include "../Common/MassStorage.h"
		
	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_MS_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/Class/MassStorage.h instead.
		#endif

	/* Public Interface - May be used in end-application: */
		/* Macros: */
			/** Error code for some Mass Storage Host functions, indicating a logical (and not hardware) error */
			#define MS_ERROR_LOGICAL_CMD_FAILED              0x80
	
		/* Type Defines: */
			/** Class state structure. An instance of this structure should be made within the user application,
			 *  and passed to each of the Mass Storage class driver functions as the MSInterfaceInfo parameter. This
			 *  stores each Mass Storage interface's configuration and state information.
			 */
			typedef struct
			{
				const struct
				{
					uint8_t  DataINPipeNumber; /**< Pipe number of the Mass Storage interface's IN data pipe */
					bool     DataINPipeDoubleBank; /** Indicates if the Mass Storage interface's IN data pipe should use double banking */

					uint8_t  DataOUTPipeNumber; /**< Pipe number of the Mass Storage interface's OUT data pipe */
					bool     DataOUTPipeDoubleBank; /** Indicates if the Mass Storage interface's OUT data pipe should use double banking */
				} Config; /**< Config data for the USB class interface within the device. All elements in this section
				           *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
				           */
				struct
				{
					bool IsActive; /**< Indicates if the current interface instance is connected to an attached device, valid
					                *   after \ref MS_Host_ConfigurePipes() is called and the Host state machine is in the
					                *   Configured state
					                */
					uint8_t InterfaceNumber; /**< Interface index of the Mass Storage interface within the attached device */

					uint16_t DataINPipeSize; /**< Size in bytes of the Mass Storage interface's IN data pipe */
					uint16_t DataOUTPipeSize;  /**< Size in bytes of the Mass Storage interface's OUT data pipe */
					
					uint32_t TransactionTag; /**< Current transaction tag for data synchronizing of packets */
				} State; /**< State data for the USB class interface within the device. All elements in this section
						  *   <b>may</b> be set to initial values, but may also be ignored to default to sane values when
						  *   the interface is enumerated.
						  */
			} USB_ClassInfo_MS_Host_t;
			
			/** SCSI capacity structure, to hold the total capacity of the device in both the number
			 *  of blocks in the current LUN, and the size of each block. This structure is filled by
			 *  the device when the MassStore_ReadCapacity() function is called.
			 */
			typedef struct
			{
				uint32_t Blocks; /**< Number of blocks in the addressed LUN of the device */
				uint32_t BlockSize; /**< Number of bytes in each block in the addressed LUN */
			} SCSI_Capacity_t;

		/* Enums: */
			enum MSHost_EnumerationFailure_ErrorCodes_t
			{
				MS_ENUMERROR_NoError                    = 0, /**< Configuration Descriptor was processed successfully */
				MS_ENUMERROR_InvalidConfigDescriptor    = 1, /**< The device returned an invalid Configuration Descriptor */
				MS_ENUMERROR_NoMSInterfaceFound         = 2, /**< A compatible Mass Storage interface was not found in the device's Configuration Descriptor */
				MS_ENUMERROR_EndpointsNotFound          = 3, /**< Compatible Mass Storage endpoints were not found in the device's interfaces */
			};
	
		/* Function Prototypes: */
			/** Host interface configuration routine, to configure a given Mass Storage host interface instance using the
			 *  Configuration Descriptor read from an attached USB device. This function automatically updates the given Mass
			 *  Storage Host instance's state values and configures the pipes required to communicate with the interface if it
			 *  is found within the device. This should be called once after the stack has enumerated the attached device, while
			 *  the host state machine is in the Addressed state.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing an MS Class host configuration and state
			 *  \param[in] ConfigDescriptorSize  Length of the attached device's Configuration Descriptor
			 *  \param[in] DeviceConfigDescriptor  Pointer to a buffer containing the attached device's Configuration Descriptor
			 *
			 *  \return A value from the \ref MSHost_EnumerationFailure_ErrorCodes_t enum
			 */
			uint8_t MS_Host_ConfigurePipes(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, uint16_t ConfigDescriptorSize,
			                               void* DeviceConfigDescriptor) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3);

			/** Sends a MASS STORAGE RESET control request to the attached device, resetting the Mass Storage Interface
			 *  and readying it for the next Mass Storage command.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *
			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum
			 */
			uint8_t MS_Host_ResetMSInterface(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);

			/** Sends a GET MAX LUN control request to the attached device, retrieving the index of the highest LUN (Logical
			 *  UNit, a logical drive) in the device. This value can then be used in the other functions of the Mass Storage
			 *  Host mode Class driver to address a specific LUN within the device.
			 *
			 *  \note Some devices do not support this request, and will STALL it when issued. To get around this,
			 *        on unsupported devices the max LUN index will be reported as zero and no error will be returned
			 *        if the device STALLs the request.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[out] MaxLUNIndex  Pointer to a location where the highest LUN index value should be stored
			 *
			 *  \return A value from the \ref USB_Host_SendControlErrorCodes_t enum
			 */
			uint8_t MS_Host_GetMaxLUN(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, uint8_t* const MaxLUNIndex)
			                          ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);

			/** Retrieves the Mass Storage device's inquiry data for the specified LUN, indicating the device characteristics and
			 *  properties.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[out] InquiryData  Location where the read inquiry data should be stored
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED
			 */
			uint8_t MS_Host_GetInquiryData(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                               SCSI_Inquiry_Response_t* const InquiryData) ATTR_NON_NULL_PTR_ARG(1)
			                               ATTR_NON_NULL_PTR_ARG(3);

			/** Sends a TEST UNIT READY command to the device, to determine if it is ready to accept other SCSI commands.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_TestUnitReady(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex)
			                              ATTR_NON_NULL_PTR_ARG(1);

			/** Retrieves the total capacity of the attached USB Mass Storage device, in blocks, and block size.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[out] DeviceCapacity  Pointer to the location where the capacity information should be stored
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_ReadDeviceCapacity(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                                   SCSI_Capacity_t* const DeviceCapacity) ATTR_NON_NULL_PTR_ARG(1)
			                                   ATTR_NON_NULL_PTR_ARG(3);
		
			/** Retrieves the device sense data, indicating the current device state and error codes for the previously
			 *  issued command.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[out] SenseData  Pointer to the location where the sense information should be stored
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_RequestSense(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                             SCSI_Request_Sense_Response_t* const SenseData) ATTR_NON_NULL_PTR_ARG(1)
			                             ATTR_NON_NULL_PTR_ARG(3);
		
			/** Issues a PREVENT MEDIUM REMOVAL command, to logically (or, depending on the type of device, physically) lock
			 *  the device from removal so that blocks of data on the medium can be read or altered.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[in] PreventRemoval  Boolean true if the device should be locked from removal, false otherwise
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_PreventAllowMediumRemoval(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                                          const bool PreventRemoval) ATTR_NON_NULL_PTR_ARG(1);
			
			/** Reads blocks of data from the attached Mass Storage device's medium.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[in] BlockAddress  Starting block address within the device to read from
			 *  \param[in] Blocks  Total number of blocks to read
			 *  \param[in] BlockSize  Size in bytes of each block within the device
			 *  \param[out] BlockBuffer  Pointer to where the read data from the device should be stored
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_ReadDeviceBlocks(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                                 const uint32_t BlockAddress, const uint8_t Blocks, const uint16_t BlockSize,
			                                 void* BlockBuffer) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(6);
		
			/** Writes blocks of data to the attached Mass Storage device's medium.
			 *
			 *  \note This function must only be called when the Host state machine is in the HOST_STATE_Configured state or the
			 *        call will fail.
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing a MS Class host configuration and state
			 *  \param[in] LUNIndex  LUN index within the device the command is being issued to
			 *  \param[in] BlockAddress  Starting block address within the device to write to
			 *  \param[in] Blocks  Total number of blocks to read
			 *  \param[in] BlockSize  Size in bytes of each block within the device
			 *  \param[in] BlockBuffer  Pointer to where the data to write should be sourced from
			 *
			 *  \return A value from the \ref Pipe_Stream_RW_ErrorCodes_t enum or MS_ERROR_LOGICAL_CMD_FAILED if not ready
			 */
			uint8_t MS_Host_WriteDeviceBlocks(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, const uint8_t LUNIndex,
			                                  const uint32_t BlockAddress, const uint8_t Blocks, const uint16_t BlockSize,
			                                  void* BlockBuffer) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(6);

		/* Inline Functions: */
			/** General management task for a given Mass Storage host class interface, required for the correct operation of
			 *  the interface. This should be called frequently in the main program loop, before the master USB management task
			 *  \ref USB_USBTask().
			 *
			 *  \param[in,out] MSInterfaceInfo  Pointer to a structure containing an MS Class host configuration and state
			 */
			static inline void MS_Host_USBTask(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo);
			static inline void MS_Host_USBTask(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo)
			{
				(void)MSInterfaceInfo;
			}

	/* Private Interface - For use in library only: */
	#if !defined(__DOXYGEN__)
		/* Macros: */
			#define MASS_STORE_CLASS               0x08
			#define MASS_STORE_SUBCLASS            0x06
			#define MASS_STORE_PROTOCOL            0x50

			#define REQ_MassStorageReset           0xFF
			#define REQ_GetMaxLUN                  0xFE

			#define CBW_SIGNATURE                  0x43425355UL
			#define CSW_SIGNATURE                  0x53425355UL
			
			#define COMMAND_DIRECTION_DATA_OUT     (0 << 7)
			#define COMMAND_DIRECTION_DATA_IN      (1 << 7)
			
			#define COMMAND_DATA_TIMEOUT_MS        10000

			#define MS_FOUND_DATAPIPE_IN           (1 << 0)
			#define MS_FOUND_DATAPIPE_OUT          (1 << 1)
			
		/* Function Prototypes: */
			#if defined(__INCLUDE_FROM_MS_CLASS_HOST_C)		
				static uint8_t DComp_NextMSInterface(void* const CurrentDescriptor);
				static uint8_t DComp_NextMSInterfaceEndpoint(void* const CurrentDescriptor);
				
				static uint8_t MS_Host_SendCommand(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo,
				                                   MS_CommandBlockWrapper_t* const SCSICommandBlock,
				                                   void* BufferPtr);
				static uint8_t MS_Host_WaitForDataReceived(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo);
				static uint8_t MS_Host_SendReceiveData(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo, 
                                                       MS_CommandBlockWrapper_t* const SCSICommandBlock, void* BufferPtr);
				static uint8_t MS_Host_GetReturnedStatus(USB_ClassInfo_MS_Host_t* const MSInterfaceInfo,
				                                         MS_CommandStatusWrapper_t* const SCSICommandStatus);
			#endif
	#endif
	
	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif

#endif

/** @} */
